Using Emma for test coverage in Ant

05 Aug 2006 17:05 - (0) comments

Here is how I have used Emma Code Coverage in a project.


<!-- init emma ant task-->

<path id="compile.classpath">

	<path refid="emma.lib"/>

</path>

<path id="emma.lib" >

	<pathelement location="${dev.lib}/emma.jar" />

	<pathelement location="${dev.lib}/emma_ant.jar" />

</path>

<taskdef resource="emma_ant.properties" classpathref="emma.lib" />	

	
<!-- Apply emma instrumentation to the classes in instrpath and copy to destdir -->

<target name="emmacompile">

	<emma verbosity="info">

		<instr instrpath="${build.classes}" destdir="${coverage.classes}" merge="true" mode="copy">

			<!-- always exclude every class with a "Test" in the name: -->

			<filter excludes="*Test*" />

		</instr>

	</emma>

</target>	

	
<path id="test.classpath">

	<!-- instrumented classes first -->

	<pathelement path="${coverage.classes}" />

	<pathelement path="${build.classes}" />

	<fileset dir="${app.lib}">

		<include name="**/*.jar"/>

	</fileset>

	<!-- include junit and mock jars-->

	<fileset dir="${dev.lib}">

		<include name="**/*.jar"/>

	</fileset>

</path>

	
<target name="test" description="Run all tests and create reports" depends="emmacompile">

	
	<!-- Run tests -->

	<junit fork="yes" haltonfailure="no" failureproperty="tests.failed" printsummary="on">

		<classpath refid="test.classpath" />

		<formatter type="xml"/>

		<formatter type="brief" usefile="false"/>

		<batchtest fork="yes" todir="${coverage.dir}">

			<fileset dir="${test.src}">

				<include name="**/*Test.java"/>

			</fileset>

		</batchtest>

	</junit>	

	
	<!-- Generate jUnit report -->

	<junitreport todir="./reports">

		<fileset dir="${coverage.dir}">

			<include name="TEST-*.xml"/>

		</fileset>

		<report format="frames" todir="./reports/junit"/>

	</junitreport>		

	
	<!-- Move the runtime coverage metadata to the coverage dir -->

	<move file="coverage.ec" todir="${coverage.dir}"/>

	<move file="coverage.em" todir="${coverage.dir}" failonerror="false"/>		

	
	<!-- Generate code coverage report -->

	<emma>

		<report sourcepath="${java.src}" depth="method">

			<infileset dir="${coverage.dir}" includes="coverage.em,coverage.ec" />

			<html outfile="${coverage.dir}/index.html" />

		</report>

	</emma>

	
</target>

If you change some of the settings you could get the following error:

java.lang.IllegalStateException: class [net.deheus.Petrik] appears to be instrumented already

This happens when you use overwrite mode in the instr task and haven't recompiled all classes.

Another problem I encountered was that not all classes were getting covered. Cleaning and recompiling solved this.

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